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9-80.

Since $4^{2} = 4 · 4 = 16$ , it follows that $3 · 4^{2} = 3 · 4 · 4 = 48$ . Rewrite each expression without exponents and compute the value.

$5^{2}$
Hint (a):
$5·5 = ?$

$2 · 5^{2}$
Hint (b):
$2·5·5 = ?$

$3^{3}$
Answer (c):
$27$

$2^{2} · 3^{3}$
Hint (d):
$2·2·3·3·3 = ?$

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